Indicating and recording instrument



A. HOESCH.

INDICATING AND RECORDING INSTRUMENT.

APPLICATION FILED APR. 7, 1917.

Patented Augf19, 1919.

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NnlcAnNe AND RECORDING INSTRUMENT.

I APPUCAHON FILED APR. 7| lgl. V 1,313,333. Y Patented Aug. 19,1915).

4 -2 SHEETS--SHEET 2.

UNITED STATES PA'IEN' @FEIS/E.

ALFRED ROESCH, OF BEOOKLYN, NEW YORK, ASSIGNOR TO CHARLES J'. TAG-LIABIIE MANUFACTURING CO., 0F BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK INDICA'IING'VA ANI)A RECORDING- INSTRUMENT.

Patented Aug. 19, i919.

Application mea April 7, 1917. serial No. 160,352.

To all whom it may concern:

Be it known that I, ALFRED RoEsCH, a citizen of the United States, and resident of the borough of Brooklyn, county ,of Kings, city and State oftNew York, have invented certain ynewand useful Improvements in Indicating and Recording Instruments, of .which the following is a specification.

Myv invention relates to indicating and recordin instruments and more particularly tot at type'ofsuch instruments which are intended to indicate and record temperatures and has for its object to providea simple construction IVwhereby chan es in tem-l perature at a given point are e ciently indicated and recorded. My invention also contemplates the provision of an ,improved capillary tube whereby temperature changes are accurately indicated and'recorded regardless of the/location of my improved instrument relatively to the point Vat which said temperature changes occur. A further object of myinvention is to provide animproved compensation arrangement whereby the pen arm and stylus will automatically maintain their correct relation tothe usual record sheet or chart. In addition to the above my invention provides an improved arrangement' for mounting the pen arm and stylus and for adjustin it relatively to said chart. My invention will be fully described hereinater and the features of novelty will be pointed out in the appended claims.

Reference is to be had to the accompanying drawings which illustrate examples of my improvement and in which Figure 1 is a face view of my improved instrument with parts broken away, the thermometer which is connected with said instrument being shown in section; Fig. '2 is a sectionalarm adjusting means; Fig. 6 isa detail face view showing a diiferent form of my improvement and Figs. 7, 8 andI 9 are cross sections of the capillary tube at successive stages in its construction.

As shown. in the illustrated example,- the "instrument comprises a casing 10 of any which Ais provided with lugs 12 having suitable apertures 13 for the accommodation of screws or other fastening devices whereby the instrument may be secured upon any convenient support. The front of the casing 10, as shown, may comprise a transparent door 14 hinged at 15 to said casing and lockedin its closed position by means of a suitable catch 16. Within the easing 10 is located the customary clock work 17, the spindle 18 of which projects through a disk 19 carried by supports 192L suitably secured to the back plate 11. This disk 19 serves as a support for the customary chart 20 which is mounted upon the spindle 18 and secured thereon by means of the screw 18a,

said chart being guided by means of lugsl 21 formed on the disk 19. As so far described, the arrangement may correspond to any well known construction.

A bracket 22 is secured at a proper point in the upper portion of the casinglO and is provided with spaced bearings 23 in axial alinement with eachother and between which a shaft 24-is journaled, one of said bearings Apreferably being adjustable as shown in Fig. 4. c The shaft 24 carries a member 25 which extends above and below said shaft and has its upper portion slotted as lindicated at 26 and its lower end in registry with an adjustable stop 27 carried by the bracket 22. A block 28 is slidable lengthwise of the slot 26 and is secured in an adjusted position upon lsaid member 25, for instance by means 'of a screw 29, said block 28 in turn being pivotally connected at 3() with a member 31. The latter is provided with a slot 32 for the accommodation of a screw 33 whereby the member 31 is adjustably combined with a second member 34, said members 31 and 34 together comprisingan adjustable link pivotally connected at 35 with the coil or active portion 36 of the capillary tube 37 which is, generally speaking, constructed of a suitable metal.

4A bracket 38 mounted in the casing 10 supports the coil 36l in operative position. The tube 37 communicates in the usual manner with a bulb 39 carried in the customary way `by a support 40 adapted to connect the bulb 39 with the element 41 in whichl the temperature changes are to be indicatedand recorded or to support it at the point where such ,changes take place.

The arm 25, block 28 and adjustable link 31, 34 provide a means whereby the pen arm or stylus may be properly adjusted to the scale range of the particular chart which 1s being used. In order to maintain the pen and pen arm in proper coperative relation to the scale or to the zero point4 or. other arbitrary division thereof and to make it possibl-e to correct the instrument when necessary, I provide a member 42 which is secured upon the shaft 24 and depends therefrom at an incline toward the front of the casing, the free end of said member 42l carrying) a transverse member 42a which pre era' ly forms an integral part thereof. A pen arm section 43 lies in surface engagement with said member 42a and is pivotally connected therewith at 44, said section 43 being .provided with a curved slot 45 which extends transversely of-said section 43 in an arc which has the pivot 44 as a center. One of the walls of said slot, the lower one in the illustrated example, is formed with gear teeth 46 which mesh with a pinion 47 carried by a shaft 48 which is journaled on and exas shown 1n Fig. 6. lVith this arrangementy the link member 31 is divided into two portends through the section 42. The shaft 48 at one end is 'rovided with an operating head 49 and at its other end is screw-threaded for the accommodation of a nut 50 which forms an abutment for one end of a coil spring 51, the other end of which engages the member 42,

In the illustrated example the-section 43 is connected with one leg of a compensating member, the other leg of which is secured to the pen arm 52 oflany customary and suite able type and carrying the usual stylus or pen 53. The compensating member above referred to consists of thermostatic laminae or, inl other words, is constructed of an inner strip of brass 54 and an outer strip of steel 55 combined 'in surface engagement with each other in any suitable way. In some cases the pen arm may comprise a' continuation of the section 43 as shown at 52a in Fig.

6; in -this case the compensating device maybe omitted or it may -be located, for lnstance,

tions 31a and 31b each of which is connected with a leg of the compensating device, whichin this case may also comprise an inner strip of brass 54a and an outer strip of steel 55'lx combined in surface engagement with each other.

It will be noted that in my improved construction the mechanism whereby the pen arm is actuated is located at' the upper por. tion of the casing 10 so that said pen arm 52 depends therefrom into coperative relation with the chart 20 and does not lextend upwardly from` said mechanism as is usually the case. 1'Vith this arrangement the ink is supplied to the pon Vin the direction in which, it ualurall)- [lows from said pen durpreventing waste and'blotting and soiling of the parts. The movements of the pen arm occasioned by the actuation of the coll 36 are also more easily brought about and the degree of friction between adjacent parts is reduced to a minimum. i

Vith the construction so far deseribed,an adjustment of the pen arm 52 with respect to the scale range of the chart 20 may be obtained by adjusting the block 28 on the arm 25 or by adjusting the members 31 and 34 relatively to each other or by both means. An adjustment of the arm 52 relatively to the zero point or other arbitrary division of the scale may be had by rotating the head 49 and with it the pinion 47 and shaft 48 which swings the section43 and arm 52 in one di- -rection or the other on the pivot 44 according to the direction of rotation of the head 49. At the same time vthe compensating device, owing to the different co-eliicients of expansion of the brass strip 54 or 54 and steelstrip 55 or 55a will maintain said arm 52 in its adjusted relation to the chart 20 regardless of any temperature changes which may take place in the instrument or at its place of location.

It will be understood that the instrument is operated in the usual manner by means of the expansion and contraction of the mercury 39 in the bulb 39 and capillary tube 37. Owing to the degree of pressure which the tube 37 in practicevis called upon to resist, the walls of said tube are necessarily considerably thicker in cross section than the bore of the tube.` Because of difliculties encountered in manufacturing it has hereto-l fore been impossible to reduce the cross sectional dimensi'on of said bore sufliciently to produce accurate temperature records, if the instrument is located at any distance from the b-ulb 39. -This is due to the coinparatively large volume of mercury contained in the capillary tube of ordinary construction, which throughout its length between the bulb and the instrument may be subjected to varying temperatures which affect said mercury and thus interfere with the action ofthe instrument. Many attempts have been made to bring about the necessary reduction ofthe bore, without, however, giving entirely satisfactory results. In consequence, very unsatisfactory and inaccurate records have been obtained in attempts 'to separate the recording instrument any considerable g distance from the bulb 39. In order to overcome these .serious objections and disadvantages and to provide an instrument which is etlicient at all times, regardless of its locati'on relatively to the bulb and which is extremely sensitive, I have provided ,a capillary tube in which the 'bore is reduced to a minimum and have further provided an improved niethod of nmking said tubing easily lnA carrying out my improved process l first produce an ordinary tube ,37 of circular cross section and having a bore 37a of sufficiently la'rge diameter to make it easy to produce, as shown in Fig. 7. The tube 37 is then attened out in any suitable manner as for .instance bypassing it between a pair of suitable rollers which deforms the bore 37a from a circular form in cross section to an elongated flattened form, as shown in Fig. S, said bore, as a matterof fact, being substantially closed by this operation. In this condition pressure or any other force may be applied to the surfaces a in the directions indicated by the arrows in F ig. 8 whereby the bore 37a is again slightly opened to, for instance, approximately two onethousandths of an inch as shown in Fig. 9, and is thus of the smallest possible dimensions. 1

lnsteadof subjecting the tube to a second pressure or other force tovopen up the bore, the tube, after being brought to the condition shown in Fig. 8, may be heated and then plunged into cold water. The sudden chilling of the metal .will cause the same to contract and open up the bore to a slight extent in approximately the same way as previously described. f

The original bore is readily produced owing to its size, as shown in Fig. 7, and may beeasily brought to its final stage by successive deformations of the tube in d1- rect'ions transverse to each other, or by first heating the metal and then chilling it, or byany other suitable method.

The operation results in a capillary tube 37 having a bore 37a of the smallest dimensions and yet uniform throughout, and which for a tube of given length contains only a minimum quantity of mercu-ry 39a. Thus, no matter how far the instrument is removed from the -bulb 39 or how great the length of theI tube 37 the interference by intermediate temperature variations will be.

so small as to be of no consequence and without eect on the operation of the instrument. Accurate and efficient indicating and recording are thus always assured.

Various changes in the specific form shown and described may be made within the scope of the claims without departing from the spirit of my invention.

I claim:

l. An instrument of the kind described comprising a casing, a movable chart therein, a coil, a capillary tube connected with said coil, a pen arm coperating with said chart to produce a record and a compensating device bodily movable as a unit relatively to said casing and having spaced members connected at one end and comprising lamina; of metals having different coeicients of expansion, the free end of one of said members of the compensating device being connected with the coil and the free. end of the other member of said compensating' device being connected with the pen arm.

2. An instrument of the kind described comprising a casing, a movable chart therein, a coil, a capillary tube connected with said coil, a shaft journaled in said casing, a pen arm carried by said shaft, a member carried by said shaft, a compensating device bodily movable as a unit relatively to said casing and bent upon itself to form two legs spaced from eachother and comprlsing laminae of metals having :different co-eflicients of expansion, a connection from the free end of one of said legs to said coil and a connection from the free end of the other of said legs to said shaft member.

. 3. An instrument of the ln'nd described comprising a casing, a movable chart therein, a coil, a capillary tube connected with said coil, a shaft journaled in said casing,

an operative connection between said shaft.

and said coil, a member depending from said shaft, a pen arm pivotally connected with and extending beyond said member, a toothed sector forming part of said pen arm, a pinion mounted on said member and meshing with said sector, and means whereby said pinion is rotated to pivotally and adjustably swing said pen arm relatively to said member.

4. An instrument of the kind described comprising a casing, a movable chart therein, -a coil, a capillary tube connected with said coil, a shaft journaled in said casin a member carried by said shaft, a block a justably mounted on said member, an a'djustable connection between said block and said coil, a member depending .from said shaft, a pen arm pivotally connected with and extending beyond said depending member, said pen arm having a transverse slot, a sector of teeth in said slot, a pinion located in said slot in mesh with said teeth, a shaft carrying 'said pinion and journaled on said depending member and an operating head i whereby said shaft and pinion are actuated to pivotally and-adjustably swing said pen arm relatively to said depending member.

In testimony whereof I have hereunto set m hand.

y ALFRED ROE-SCH. 

